Profile dresser with follower rigidly supported in one direction



R. E. PRICE PROFILE DRESSER WITH FOLLOWER RIGIDLY SUPPORTED IN ONE DIRECTION Filed Dec. 16. 1960 March 5,l 1963 Q ww qw United States Patent dice g' Patented Mar. 5, 1953 3,079,9@7 PRGlTILE DRESSER WHH FGLLOWER Rl'GBLY SUPPRTED DI NE BBPEJCTHGN Raiph E. Price, Waynesboro, Pn., assigner to Landis Tool Company, Waynesboro, Pa. Filed Dec. 16, 1960, Ser. No. 76,243 llaims. (Si. 12S-ll) This invention relates to dressing devices for grinding wheels, particularly for grinding wheels having a formed or a non-cylindrical peripheral surface.

The means generally used for dressing a form on a grinding wheel consists of a follower on the movable portion of the dressing tool and a stationary profile bar having a surface corresponding tothe surface to be formed on the grinding wheel. The follower is held in engagement with the profile bar by means of a spring acting on the dressing tool. In some cases, the arrangement of stationary `and movable parts may be reversed. For the purpose of illustration, the movable dressing tool will be considered.

When such a tool is traversed across the grinding wheel, the follower travels across the prole bar and causes the tool to move toward and away from the grindinug wheel in accordance with the form to be dressed on the wheel. As the follower moves along the profile bar, it is subjected to forces other than that required to move the dressing tool toward and away from the grinding wheel. These forces are transmitted through the follower to the dressing tool, generally in the form of a slight rotation of the tool holder and, therefore, of the dressing tool itself. Any such movement of a diamond during a dressing operation, changes the relation between the diamond and the grinding wheel so that it may dress `a form sufficiently different from the form on the prole 'oar as to malte the worlipieces ground by the wheel unacceptable.

It is, therefore, an object of the present invention to provide a means for transmitting the form of a profile bar to a dressing tool to a grinding wheel while, at the same time, preventing the transmission to said dressing tool of other forces acting on the follower.

FIG. 1 is a right hand end view of the combined dresser and steady rest with the dresser shown in section.

FiG. 2 is a partial sectional plan view of the follower mounting.

FG. 3 is a partial front elevation showing the follower mounting.

Numeral 1G indicates the bed of a grinding machine. Carriage 11 is slidably mounted on bed 10. Swivel table 12 is mounted for angular adjustment on carriage 11. Dresser housing 13 is attached to table 12. inside housing 13, there is slidably mounted a sleeve l5. Sleeve 15 has a radially extending portion 2t?, the function of which will he described later.

Tool holder 36 is slidably mounted for limited endwise movement in sleeve l5. Dressing tool 31 is secured in the riUht hand end of tool holder 30. Stop member 35 is partially inserted in tool holder 36. Member 35 extends radially into an elongated slot 37 in sleeve 15. Slot 37 determines the extent of adjustment of tool holder 3) in sleeve 15.

The means for effecting axial adjustment of dressing tool 31 toward and from grinding wheel 32, comprises a differential adjusting screw 3S having a flanged member 43 threaded on the right hand end of threaded portion A and extending into bore 41 in the left end of tool holder 30. Pin 42 in the hanged portion 43 extends axially to the right to engage slot 44 in the end of tool holder 30. The purpose of pin 42 and slot 44 is to prevent rotation of member 46 with screw 3S. The other end of screw 38 has a thread B of different pitch which co-acts with a threaded bore in cap member 39. Member 39 has a reduced portion 5t) extending into housing 51. Ratchet 53 is formed on sleeve member 54 and is actuated by a piston operating pawl (not shown). An elongated key way 58 in sleeve member 54 co-acts with key 56 in screw 33.

Sleeve l5 is bored to two diameters, the smaller diameter to the right and the larger diameter to the left. The left end of tool holder 3h has a reduced portion 66. Washer 61 on reduced portion 60 of tool holder 30 extends radially into Ithe larger diameter bore of sleeve l5. Spring 65' bears at the right hand end against washer 6l and the left hand end against washer `62 held in predetermined position on reduced portion 6i) of tool holder 3) by snap ring 63. Spring 65 urges tool holder 3i) to the left and through flanged member 40 to compensate for backlash between member 40 and the threads on portion A of screw 38. Spring 65, acting through member dit and screw 3S, also serves to take up backlash between thread portions B of screw 38 of member 39 into which it is threaded.

The radially or laterally extending portion 26 of sleeve 15 has attached thereto Va follower member 2l. Member 2l is adapted to engage profile bar 22 supported on bracket 2.3 on bed l@ of the grinding machine. Portion 20 is movably supported on flexible member 71 in an opening 7i) in housing 13. The means for preventing forces resulting from the relative movement between proiile bar 22 and follower 2l from being transmitted through portion 20 to sleeve l5 and tool holder 30, consists of flexible member 71 having an end portion 72 which is attached to housing 13. Member 71 extends through an opening 73 in portion 20. Opening 73 is wide enough not to interfere with the necessary movement of portion 2li as it follows the contour of profile bar 22. The other end of member 71 has a portion 74 which is attached to portion 2t?. Member 71 permits in and out movement of portion 20. Crosswise movement of portion 2h which would be transmitted to dressing tool 3l is prevented by the rigidity of member 7l in this direction.

While the movement of follower 21 on flexible member 7l is an arc, the variation from a str-aight line is negligible and member 71 has the effect of controlling follower 2l so that a minimum of lateral movement is transmitted to dressing tool 31.

Follower 2l is held in engagement with profile bar 22 by means of spring Si? supported in hole S2 in housing i3. Spring dit extends into a similar hole 84 in portion Z0.

I claim:

l. A dressing device for a grinding wheel comprising a housing, a dressing tool in said housing slidably mounted for movement transversely and longitudinally of said grindinf7 wheel, a prole bar for guiding said dressing tool .to provide a predetermined contour on said grinding wheel, a follower on said dressing' tool, means for holding said follower against said profile bar, means for preventing uncontrolled movement of said follower and said dressing tool comprising `an elongated guide member having one end attached to said follower, the other end being attached to said housing, said guide member being rigid in the direction of said longitudinal movement.

2. A dressing device for a grinding wheel comprising a housing movable axially of said grinding wheel, a sleeve slidably mounted in said housing, a tool holder adjustably mounted in said sleeve, said sleeve having a portion laterally extending through an opening in said housing, a profile bar, a follower carried by said laterally extending portion, means for holding said follower against said prole bar, and a guide member between said housing and said follower which is rigid in one direction and resilient in .another directionV tol follow the -form on s-aid prol'ilefbar.

3. A dressing device for a grinding Wheel comprising a housing movable `axially of said grinding wheel, a sleeve slidably mcnlritedA in saidV housing,- a tool` holder adjustably mounted; in said sleeve, said sleeve having a portion eX- tending` laterallyl through saidj housing, a profile bar, a followerl carried byv saiddaterallv extendingportion, means fof holdinglsaid follower against/Y' said' profile bar, anda guide member between said' housing and saidfollower which is rigid in the direction of said axial movement and resilient in the sleeve of said profile bar.

4. A- dressing tool for` a grinding wheely comprising'y a housing movable *axiallyI of saidl grinding wheel, a sleeve slidably mountedlin said-housing,l a toolY holder adjustably mounted in s'ai'dl sl'eeveQ-'said sleeve having'V a portion exetending lateally through' saidl housing,- a profile bar, a' follower carriedl by said"l laterally extendingfportion, means for holding said follower againstv poleV bar, and af guide member betweenl said housing' and' said follower whichis rigidin the direction of saidy axialy movement of said follower and resilient` ina directionl transversely of said axial'movement.Y

5. Mounting means for a grinding wheel dressing tool comprising `a housingA Vmovable axially of the grinding wheel, sa sleeve slidably mounted in said housing, a tool holder adjustably mounted in said sleeve, said sleeve having a depending portion, arproiile bar, a follower carried by said depending portion, Ameans for holding said follower against said' 4profile' bar, andf means for holding'said depending portion against movement by dellec'ting forces resulting from the relative movement between said fo1- lower and said'proiile bar, comprising a cantilever member having one end mounted in saidhousing, the other end in said follower.

References Cited in the;I fire of this patent UNITifDJ STATES vPA`TE1\ITSv 

2. A DRESSING DEVICE FOR A GRINDING WHEEL COMPRISING A HOUSING MOVABLE AXIALLY OF SAID GRINDING WHEEL, A SLEEVE SLIDABLY MOUNTED IN SAID HOUSING, A TOOL HOLDER ADJUSTABLY MOUNTED IN SAID SLEEVE, SAID SLEEVE HAVING A PORTION LATERALLY EXTENDING THROUGH AN OPENING IN SAID HOUSING, A PROFILE BAR, A FOLLOWER CARRIED BY SAID LATERALLY EXTENDING PORTION, MEANS FOR HOLDING SAID FOLLOWER AGAINST SAID PROFILE BAR, AND A GUIDE MEMBER BETWEEN SAID HOUSING AND SAID FOLLOWER WHICH IS RIGID IN ONE DIRECTION AND RESILIENT IN ANOTHER DIRECTION TO FOLLOW THE FORM ON SAID PROFILE BAR. 